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United States Patent |
6,108,885
|
Cox
|
August 29, 2000
|
Insertion tool
Abstract
The invention relates to insertion tools. Insertion tools are known to be
used to secure a threaded insert to a plate-like member, to receive a
threaded stem or stud of another component that needs to be attached to
the plate-like member. The object of the invention is to allow a male
threaded stud to be attached to a plate-like member. The objective is met
by a tool that comprises a pair of handles pivotally attached to each, a
drawbar in engagement with one handle to the opposite side of the pivot to
the hand grip, the drawbar extending out of the other handle to lie within
a guide tube attached to the said other handle, an extension tube attached
to the support tube, an extension piece to the drawbar having a threaded
end section at one end to engage a threaded hole in the end of a drawbar
and having a threaded bore at the opposite end to receive a threaded stem
intended to be attached on or in a support.
Inventors:
|
Cox; Norman (Sheffield, GB)
|
Assignee:
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James Neill Holdings Limited (GB)
|
Appl. No.:
|
330957 |
Filed:
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June 11, 1999 |
Foreign Application Priority Data
Current U.S. Class: |
29/268; 29/270 |
Intern'l Class: |
B23P 019/04 |
Field of Search: |
29/268,270
81/44,418,421,422
|
References Cited
Assistant Examiner: Wilson; Lee
Attorney, Agent or Firm: Trexler, Bushnell, Giangiorgi & Blackstone, Ltd.
Claims
What is claimed is:
1. A tool for the attachment of a threaded stem on or in a support,
comprising a pair of handles pivotally attached to each, a drawbar in
engagement with one handle to the opposite side of a pivot to the hand
grip, the drawbar extending out of the other handle to lie within a guide
tube attached to the said other handle, an extension tube attached to a
support tube, an extension piece to the drawbar having a threaded end
section at one end to engage a threaded hole in the end of a drawbar and
having a threaded bore at the opposite end to receive a threaded stem
intended to be attached on or in a support.
2. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein the extension tube is a single member of predetermined
length.
3. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein the extension tube is formed by an extension piece and a
co-operating bush, the bush being replaceable by bushes of different
lengths, whereby to accommodate different lengths of threaded stem.
4. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein the handles of the tool are spring loaded to an open
position.
5. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein an adjustable stop means is provided to limit the degree
to which the handles can be closed, and hence the degree to which the
drawbar and extension piece can be withdrawn, to control the degree to
which the end cap or fastener can be compressed.
6. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein the drawbar is of predetermined length and is rotatably
mounted on the handles, to allow an adjustment of the position of
extension piece within the extension tube, and whereby threaded stems or
studs of different lengths can be accommodated.
7. A tool for the attachment of a threaded stem on or in a support as in
claim 1, wherein the extension tube is formed by two components, an
extension piece to engage the guide tube and a replaceable bush to receive
the threaded end section of the extension piece, the length of bush being
selected to suit the length of the threaded stem.
8. A tool for the attachment of a threaded stem on or in a support as in
claim 1, and whereby to allow the tool to serve a conventional purpose the
handles, drawbar and support tube are retained, and the extension tube and
extension piece removed and replaced by a shorter extension tube attached
to the guide tube, a rod, threaded at both ends extending through the
extension tube to engage by one end a threaded bore on a drawbar, and to
be engaged at the other end by a threaded insert.
Description
This invention relates to insertion tools.
There are numerous instances where an internally threaded insert needs to
be located on a plate-like member or in a blind hole in a support member,
to receive the threaded stem or stud of another component, or a bolt, and
fixing tools for such threaded inserts are well known and in relatively
widespread use.
In addition to the fixing of threaded inserts there is a growing need for
the fixing to a plate-like member or in a blind hole in a support of a
male threaded stud. Purpose built tools are available, but they are
relatively expensive. It is possible that one plate-like member or support
member may need to be provided with both female threaded inserts and male
threaded studs, it has, hitherto, necessitated an operative being provided
with two tools, one for each task.
The objective of the present invention is to provide a simple and
relatively inexpensive tool for the attachment of a threaded stem or stud
on or in a support member. A secondary objective is to provide a simple
and relatively inexpensive means of converting a tool for the attachment
of a threaded insert to a tool for the attachment of a threaded stem or
stud, on or in a support.
According to the present invention, a tool for the attachment of a threaded
stem on or in a support, comprises a pair of handles pivotally attached to
each, a drawbar in engagement with one handle to the opposite side of the
pivot to the hand grip, the drawbar extending out of the other handle to
lie within a guide tube attached to the said other handle, an extension
tube attached to the support tube, an extension piece to the drawbar
having a threaded end section at one end to engage a threaded hole in the
end of a drawbar and having a threaded bore at the opposite end to receive
a threaded stem intended to be attached on or in a support.
Thus, a threaded stem on which is located an end cap or fastener sleeve is
screwed into the extension piece to the drawbar until the end cap or
sleeve butts against the end of extension tube located on the support
tube, the handles of the tool being in the fully open position. Closing of
the handles causes the drawbar and hence the extension piece to be drawn
rearwardly through the extension tube and the guide tube. Consequently,
the end cap or fastener sleeve is compressed against the end of the
extension tube. Thus, with the end cap or fastener located in a hole on a
support or through a hole in a plate-like member, compression of the end
cap or fastener sleeve causes the end cap or fastener sleeve to lock in
the hole, and increase the grip between the end cap or fastener sleeve and
the threaded stem, to attach the threaded stem to the support in secure
manner. With a plate-like support the end cap or fastener sleeve extends
through a hole therein to position the end from which the threaded stem or
stud emerges flush with the surface of the plate-like support.
Alternatively, the end cap or sleeve is located in a blind hole in a
support body with the end from which the threaded stem or stud emerges
flush with the surface of the body. In both instances, the outcome is that
a threaded stem or stud emerges directly from the surface of the plate or
the support body.
Preferably, the handles of the tool are spring loaded to the open position,
and further preferably an adjustable stop means is provided to limit the
degree to which the handles can be closed, and hence the degree to which
the drawbar and extension piece can be withdrawn, to control the degree to
which the end cap or fastener can be compressed.
Still further preferably, the drawbar is of predetermined length and is
rotatably mounted on the handles, to allow an adjustment of the position
of extension piece within the extension tube, and whereby threaded stems
or studs of different lengths can be accommodated.
Whilst the tool as defined above may be a dedicated tool for the purpose of
attaching threaded stems or studs to a support, a major improvement over
the prior art lies in the fact that the handles, drawbar and support tube
can be common denominators in a tool for attaching a threaded stem and a
tool for attaching a threaded insert to a support. As is discussed above,
to enable the attachment of a threaded stem or stud on or in a support,
there is provided an extension piece to the drawbar and an extension tube
to the support tube. By removing the extension tube and the extension
piece to the drawbar and replacing them by a rod threaded to opposite ends
together with a shorter extension tube for attachment to the guide tube,
the rod being attached to the end of the drawbar and having a threaded
insert located on its exposed threaded end, it allows the tool to be used
in known and conventional manner to secure a threaded insert on or in a
hold in a support.
One embodiment of the invention is illustrated in the attached schematic
drawings in which:
FIG. 1 is a part sectional side elevation of an insertion tool in
accordance with the invention;
FIG. 2 corresponds to FIG. 1, but shows an alternative construction; and
FIG. 3 corresponds to FIG. 1 but shows the tool converted for convention
use.
In the drawings a tool 1 comprises a pair of handles 2 pivotally connected
at 3, there being a mount 4 for a spring (not shown) to urge the handles
to an open position. A drawbar 5 that extends through the handles and into
a guide tube 6 attached externally to one of the handles. The other of the
handles has a projection 7 to engage between shoulders 8 on the drawbar
and whereby a closing of the handle withdraws the drawbar 5 along the
guide tube 6.
As is illustrated in FIG. 1, and to enable the tool to secure a threaded
stem or a stud to a support, an extension tube 9 is provided and attached
to the guide tube 6 and there being an extension piece 10 for the drawbar
having a threaded end section 11 to locate in a threaded bore 12 in the
end of the drawbar 5. To the opposite end of the extension piece, is a
threaded bore 13 to receive a threaded stem or stud 14 on which is located
a blind cap 15.
With the tool assembled and the threaded stem or stud in place, the blind
end cap 15 can be positioned through a hole in a plate or in a blind hole
in a support body, and when closing of the handles causes the drawbar and
the extension piece to retract to urge the end of the end cap against the
end of the extension tube, to cause the cap to compress and hence lock
against the sides of the hole in which it is located, to attach the
threaded stem to a support in most secure manner.
As is illustrated in FIG. 2, and to enable the tool to accommodate threaded
stems or studs 14 of different lengths, the extension tube 9 of FIG. 1 is
replaced by an extension piece 9A to engage the guide tube 6, in turn
engaged by a bush 9B to receive the threaded end section 11 of the
extension piece 10. Here, the bush 9B can be replaced by bushes of
different lengths to allow the accommodation of different lengths of stem
or stud 14.
To convert the tool of the invention to serve the conventional purpose of
attaching a threaded insert to a support, the tool insofar as those
components 1 to 6 and 12 and concerned are retained, and the extension
tube 9 and extension piece 10 removed. Thus, as is shown in FIG. 3 there
is provided a shorter extension tube 16 for attachment to the guide tube
6, along with a rod 17 threaded at its two ends 18 and 19, the threaded
end 18 engaging the threaded bore 12 on the drawbar 5 and a threaded
insert 20 is positioned on the threaded end 19. With then the insert
located through a hole in a support plate or in a blind hole in a support
member, operation of the tool causes the compression of the threaded
insert and its locking in its hole.
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